vectors

Question: The angle between two vectors given by $6\bar i + 6\bar j - 3\bar k$ and $7\overline i + 4\overline j + 4\overline k $ is

1) ${\cos ^{ - 1}}\left( {\frac{1}{{\sqrt 3 }}} \right)$

2) ${\cos ^{ - 1}}\left( {\frac{5}{{\sqrt 3 }}} \right)$

3) ${\sin ^{ - 1}}\left( {\frac{2}{{\sqrt 3 }}} \right)$

4) ${\sin ^{ - 1}}\left( {\frac{{\sqrt 5 }}{3}} \right)$

Solution:

Explanation: explanation

multiplication-of-vectors

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